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SDI FINAL EXAM WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL DEFINED
ANSWERS LATEST 2025 ALREADY GRADED A+
Objects under water appear:
1: The same size as they do on land.
2: Twice as large as they do on land.
3: Closer and larger than they do on land.
4: Smaller and farther away than they do on land. - (answers)Closer and larger
than they do on land.
As you descend:
1: Colors appear to fade.
2: Reds and oranges are among the first colors to disappear.
3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites.
4: All of the above. - (answers)All of the above.
Which of the following statements is true? There may be more than one correct
answer.
1: Water is 400 times denser than air.
2: Water is 800 times denser than air.
3: Sound travels about four times faster underwater.
4: Both the second and the third answer are correct. - (answers)Both the second
and the third answer are correct.
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Which of the following is/are true?
1: Water conducts heat away from your body ten times faster than air does.
2: Water conducts heat away from your body 25 times faster than air does.
3: Fresh water conducts heat away from your body faster than salt water does.
4: Salt water conducts heat away from your body faster than fresh water does. -
(answers)Water conducts heat away from your body 25 times faster than air
does.
When water stratifies itself into layers, according to temperature, the boundary
between layers is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline. - (answers)Thermocline.
Which of the following is/are true?
1: Tides can make the water at a particular dive site noticeably deeper or
shallower than you may have experienced previously.
2: Tidal currents can be very strong, making diving difficult or even dangerous.
3: Strong tidal currents can have an adverse effect on visibility.
4: All of the above. - (answers)All of the above.
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The sun warming water near the equator, coupled with the earth's rotation, is the
primary cause of permanent ocean currents.
1: True.
2: False. - (answers)True.
Which of the following is/are true?
1: If caught in a rip current, swim directly towards shore, using the most powerful
kick possible.
2: If caught in a rip current, swim perpendicular to shore, until you are completely
out of the rip current, then swim in towards shore.
3: If caught in a rip current, swim parallel to shore, until you are completely out of
the rip current, then swim in towards shore.
4: Don't fight the rip current; relax and let it carry you closer to shore. -
(answers)If caught in a rip current, swim parallel to shore, until you are
completely out of the rip current, then swim in towards shore.
We measure waves by their height and weight.
1: True.
2: False. - (answers)False.
Explanation:
We measure waves by their height and length.
Which of the following best describes the formation of surf?
SDI FINAL EXAM WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL DEFINED
ANSWERS LATEST 2025 ALREADY GRADED A+
Objects under water appear:
1: The same size as they do on land.
2: Twice as large as they do on land.
3: Closer and larger than they do on land.
4: Smaller and farther away than they do on land. - (answers)Closer and larger
than they do on land.
As you descend:
1: Colors appear to fade.
2: Reds and oranges are among the first colors to disappear.
3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites.
4: All of the above. - (answers)All of the above.
Which of the following statements is true? There may be more than one correct
answer.
1: Water is 400 times denser than air.
2: Water is 800 times denser than air.
3: Sound travels about four times faster underwater.
4: Both the second and the third answer are correct. - (answers)Both the second
and the third answer are correct.
,2|Page
Which of the following is/are true?
1: Water conducts heat away from your body ten times faster than air does.
2: Water conducts heat away from your body 25 times faster than air does.
3: Fresh water conducts heat away from your body faster than salt water does.
4: Salt water conducts heat away from your body faster than fresh water does. -
(answers)Water conducts heat away from your body 25 times faster than air
does.
When water stratifies itself into layers, according to temperature, the boundary
between layers is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline. - (answers)Thermocline.
Which of the following is/are true?
1: Tides can make the water at a particular dive site noticeably deeper or
shallower than you may have experienced previously.
2: Tidal currents can be very strong, making diving difficult or even dangerous.
3: Strong tidal currents can have an adverse effect on visibility.
4: All of the above. - (answers)All of the above.
, 3|Page
The sun warming water near the equator, coupled with the earth's rotation, is the
primary cause of permanent ocean currents.
1: True.
2: False. - (answers)True.
Which of the following is/are true?
1: If caught in a rip current, swim directly towards shore, using the most powerful
kick possible.
2: If caught in a rip current, swim perpendicular to shore, until you are completely
out of the rip current, then swim in towards shore.
3: If caught in a rip current, swim parallel to shore, until you are completely out of
the rip current, then swim in towards shore.
4: Don't fight the rip current; relax and let it carry you closer to shore. -
(answers)If caught in a rip current, swim parallel to shore, until you are
completely out of the rip current, then swim in towards shore.
We measure waves by their height and weight.
1: True.
2: False. - (answers)False.
Explanation:
We measure waves by their height and length.
Which of the following best describes the formation of surf?
